Screw-bolt-rolling machine.



H. DESPAIGNE. SCREW BOLT ROLLING MACHINE. APPLICATION FILED NOV. 6,1907.

Patented Aug. 1,1911.

6 SHEETS-SHEET 1.

lnve n fa FMQ Wit nude! fiA-itarner H. DESPAIGNB.

SCREW BOLT ROLLING MACHINE.

APPLIOATION FILED NOV. 6, 1907.

6 SHEETS-SHEET 2.

Patented Aug. 1, 1911.

Inventor 2? A a Tu A If 3 a M It hm V m U I a B a A m a I. w I m I i.

l AHurne H mull PLANOGRAF'N c0.. WASHINGTON. D. c;

H. DESPAIGNE. SGREW BOLT ROLLING MACHINE.

APPLICATION FILED NOV. 6, 1907. v 999,634. Patented Aug. 1, 1911.

6 SHEETS-SHEET lnvenior Wifnefles I M W III/6 11 a A-tiorneqs H.DESPAIGNE.

SCREW BOLT ROLLING MACHINE.

APPLICATION FILED NOV. 6, 1907.

999,634, Patented Aug. 1, 1911.

6 SHEETS-SHEET 4.

Wifneflcd W Z Q By Afiorneys COLUMBIA PLANOOIAPH CO" WASHINGTON, D- C H.DESPAIGNE. SCREW BOLT ROLLING MACHINE. APPLICATION FILED NOV. 6, 1907.999,634 Patented Aug. 1, 1911.

B SHEETSSHEET 5.

I ML.

CCILUMBIA PLANOGRAPH (20., WASHINGTON, D. C.

H. DESPAIGNE.

SCREW BOLT ROLLING MACHINE. APPLICATION FILED NOV. 6, 1907.

Patented Aug. 1, 1911.

6 SHEETS-SHEET 6.

. MSMM' CDLUMBIA PLANOGRAPH co., WASHINGTON. D. c.

UNITED STATES PATENT OFFICE.

HENRI DESPAIG NE, 0F BRUSSELS, BELGIUM.

SCREW-BOLT-ROLLING MACHINE.

Specification of Letters Patent.

Patented Aug. 1, 1911.

Application filed November 6, 1907. Serial No. 400,943.

is a specification.

The machines at present used for producing screw threads in hot piecesare adapted primarily for the manufacture of wood screws. These screwsneed not have threads of mathematical exactness, and it happens veryoften that the threads vary in pitch at different points of the screw.Further more it is not absolutely necessary that the body of thesescrews be of a constant diameter nor even that it be exactly circular.

- It is quite a different matter when machine thereof; Fi 9 screws areto be manufactured, or any other screw-threaded male member to be usedwith a female screw-threaded member, then the screw thread must registerexactly with the corresponding screw thread of the nut. One embodimentof the machine is shown by way of example on the annexed drawing, inwhich,

Figure 1 is a side view of the machine; Fig. 1 is a longitudinalsectional view is a top plan view of the machine; Fig. 2 is a top Viewof the screw bolt holder; Figs. 3 and 4 are opposite end elevations ofthe machine. Fig. 8 is a detail view of the screw ejector; Fig. 4represents the device which returns the rollers to their initialposition after the finished screw bolt has been ejected; Fig. 5 is asection on. line AB of Fig. 4*; Fig. 6 is a front view of the front headof the machine and shows how the three rollers are fitted; Fig. 6 is adetailed view of one of the sliding members shown in Fig. 6; Fig. 7 is asection on line OD of Fig. 6; Fig. 8 is a section of the rack bar and ofthe looking bolt for the adjustment of the rollers; Fig. 9 is a top viewon the rear head of the machine, showing how the roller shafts aremounted on this rear part; Fig. 10 is a section on line EF of Fig. 9;Figs. 11, 12 and 13 show a top view and longitudinal. and transversesections of the joints which communicate the movement of the main shaftto the roller shafts, and Fig. 14 represents a detail of the mechanismwhich communicates the rotating movement to the roller shafts and of thedevice allowing the micrometric circular adjustment of the rollers.

The main shaft 1 of the machine is driven through a pulley 2 of largediameter and with a heavy broad rim which enables it to act as aflywheel. On this pulley or flywheel runs a belt (not shown) which canbe driven in any suitable way. The pulley 2 runs loose on the shaft 1and its rotation may be communicated to the shaft by means 7 of anysuitable friction-gear. This gear is thrown in and out by means of atwo-armed lever 3, connected to a rod 4, which is op erated by a handlever 5. The hand lever 5 is fixed in the notches of the sector 7 bymeans of a yielding latch 6. This device allows for the wear of thegearings and of constantly assuring a perfect power trans mission.

On one end of the shaft 1 is keyed a toothed wheel 8 which gears withthe toothed wheels 9 and 9 fixed on small shafts l0 and 10*, which areplaced horizontally at 120 from each other and concentrically to theshaft 1. The arrangement of these wheels on their shafts is representedin detail in Fig. 14. The gearing wheels 9 are loose on the shafts 10and each is provided with a long hub 97. Thefront face of this hub isscrewshaped. On the projecting portions of the shafts 10 are mountedsleeves 98, the faces of which are opposed to the screw-shaped faces ofthe wheel hubs 97. The sleeves 98 are notched inside. Into these notchesfit feathers 99 fixed on the shafts 10. These sleeves 98 can,consequently, slide on the shafts, but when rotated cause the shafts torotate. The sleeves 98 are adjusted by means of the nuts 100, and a veryfine thread cut on the end of the shafts 10. The sleeves98 constitutelongitudinally adjusting devices for the shafts 10 and 17. The rotationof the pinion 8 causes the pinions 9 to rotate.

The shafts 10 and 1O are journaled in bearings 10 which are in plate 11(Figs. 9 and 10). The plate 11 is provided on its circumference with ascrew thread 12. This screw thread registers with a worm 13, the axle ofwhich projects with its square end 14 from the cast-iron casing 15 whichforms the rear supporting head of the shafts 17 and in which the plateis disposed. This casing 15 is fixed on the frame 16 of the ma chine.When turning the worm 13 (for instance by hand, by means of a handlefixed on the square end 14), the plate 11 is I the machine. On the partof this rod which moved. This allows of adjusting the three shaftsmounted in plate 11 relatively to the shaft 1. and to change theinclination of the roller shafts according to the screw threads to beproduced. It will be readily noticed, that the movements of the plate 11do not interfere with the transmission of the rotation from the shaft 1to the shafts 10 and 10 and that it does not alter the angle at whichthe three shafts are mounted relatively to each other. A scale on theoutside of the plate 11 allows of exact adjustment.

The roller shafts 17 are driven from the shafts 10 and 10 by means ofpeculiar construction represented in detail in Figs. 11,

12 and 13. The horizontal shafts 10 and 10 each has on one of its endsan enlarged cylindrically bored head 18, the outer cylindrical part ofwhich turns in the bearing 10 of the plate 11. Inside of thiscylindrically bored head 18 and at its bottom is provided a suitablyshaped piece 20 adapted to form a seat for the ball-shaped end 21 of theshaft 17. This ball-shaped end is pressed against the seat 20 by meansof a threaded ring 22, which is screwed in the front part of the shafthead and rests against the ball-shaped head 21. In this way, thelongitudinal pressure exerted on the shafts 17 during the rollingprocess, is absorbed by the shafts 10 and 10 and plate 11. Theball-shaped heads 21 are traversed by pivot members, the ends 23 ofwhich rotate in the disk-like bearings 24, carried by the shaft heads18. As represented in Figs. 11, 12 and 13, the bearings 24 are mountedin the slots 25 in such a way that the movement of the shafts 10 and 10and of the shaft heads 18 causes the bearing to rotate, whatever therelative inclination of the axles 17 and the shafts 10 and 10. It willbe noticed that, owing to this special construction, any inclination canbe given to the shafts 17, by turning the plate 11 to the right or tothe left, even while the machine is running and without interfering withthe transmission of the movement. In thus changing the angle of theshafts 17, the rollers 29 are also adjusted relatively to each other.

The three shafts 17 project across the front head 28 of the machine andhear each at its end a roller 29 which is provided with groovescorresponding with the screw thread which is to be produced.

The solid or hollow piece which is to be provided with a screw thread,is placed in a holder 80, which is provided with an opening 31 (Fig. 2)into which the head of the bolt or screw bolt is introduced, so that itsaxis registers with the axis of the rolling apparatus. Holder 30projects from a rod 32, which slides in a sleeve 83, supported by astandard 34, rigidly fixed. to the frame of projects from the standard34, a ring or nut 35 can slide, which, when the rod is pushed forward,will strike, at a given moment, the end of the lever 36. This deviceallows of adjusting the length of the screw-threaded part, as will beexplained hereinafter. The forehead has the form of an open box orcasing (Figs. 1, G and 7) rigidly mounted on the frame 16 of themachine. The vertical wall of this box or casing bears three sheaths 37,38, 39. In each of these sheaths is mounted a sliding member (40, 41,42). Each of these sliding members bears, at its end, a universalbearing 44 and 44, each of which bears one of the shafts 17. In thisway, the rotation of the shafts 17 is assured and consequently therotation of the rollers, whatever he the inclination of the shafts andhowever neaigthe rollers be placed to each other.

The sliding member 40 is mounted in its sheath 3'? in such a way as tomove longitudinally under the action of screw-threaded nuts These nutsare turned by hand and allow of adjusting the distance of the shaftmounted in the bearing 44 to the rolling axis. But this adjustment ismade once for each determined diameter which is to be rolled and, whennormally running, the member 40 remains longitudinally stationary in itssheath.

As to the members 41 and 42, they bear their bearings of one piecethrough the intermedium of a screw-threaded rod, having a lock nut 45,allowing of the independent adjustment of the position of the bearingsin the members. These screw-threaded rods rest with their outer ends 46on two wedgeshaped supports 47. These wedge-shaped supports 47 areadapted to slide along two vertical guides 48, fixed to the box orcasing 28. According to whether these wedgeshaped pieces 47' go up ordown, along their guides 48, they tend to push the shafts 1? nearer tothe rolling axis or to permit them to recede from it. The twowedge-shaped pieces 47 always move together owing to the fact that eachof them is provided on its vertical face with a rack 49, each of whichmeshes with a corresponding pinion 50, both of which are fixed on acommon axis 51 which traverses the forehead 28. This kind of support forthe roller shafts assures an absolute rigidity. In fact, after the beginning of the rolling process and during this process, the memberswhich support the shafts are completely blocked and protected againstall spreading efforts on the part. of the working piece. Thisconstruction forms a very important feature in the production of regularscrew threads.

The axle 51 bears in the middle a toothed wheel 52 which engages with atoothed rack 53, represented in Fig. 8. The toothed rack slides in ahorizontal guide rigidly fixed on the frame and bears at its end a head54, the position of which can be adjusted. On the head is a tooth andthis head is connected to a rectangular and internally threaded member56 which slides in a casing 57 of the toothed rack. Member 56 isthreaded and receives the screw-threaded end 58 of a rod 59. The otherend of the rod 59 is made square so as to adapt it to receive a key. Byturning rod 59, the position of the head 54 is adjusted. The toothedrack can consequently be moved forward and backward, the head 54abutting against the locking bolt 60. By moving the toothed rack wheel52 on the shaft 51 is turned and the wheels 50 are caused to rotate thusproducing the adjustment of the sliding memhers 41 and 42 in such manneras to cause the rollers to he moved inwardly or outwardly according tothe diameter of the piece to be worked. This device allows pieces ofdifferent diameters to be worked and also for the adjustment of thetools necessitated by the wear of the same. The head 54 remainsstationary during the rolling operation against a locking bolt 60.Vithdrawing of the locking bolt at the moment when the screw thread isfinished permits the screw to be ejected by means of the mechanism to bereferred to hereafter. The bolt 60 receives only a small part of theroller pressure, owing to the rolling shafts being mounted on radiallymovable supports resting against wedgeshaped pieces 47 which absorb mostof the said pressure.

The operation is as follows: WVhen the machine. has been started and therollers caused to rotate, the operator places the heated bolt in theclutch 30 and exerts a pressure on the shaft 32 to force the end of thebolt between the rollers. As soon as the work-piece has been caught bythe rollers, their rotation causes it to advance and the screw thread isrolled into the 'same. During this entire process the head 55 of thetoothed rack rests in contact with the looking bolt 60. The toothed rack53 being also fixed, the wheel 52, the axle 51, the wheels 50, thetoothed racks 49 and the shafts 17 maintain their relative positionswith the rollers. As the rolling proceeds, the shaft 32 advances and ata given moment, which is predetermined by the length which the threadedpart of the bolt is to have, the nut 35 abuts against the end of thelever 36 (Figs. 1, 1 and 3 The movement of the lever causes the rod 63(Fig. 3 to move. Rod 63 operates the lever 64 mounted on the shaft 65.Lever 64 has a finger 66 which rests. against a projection 67 on thelocking bolt 60. At the moment when the rod 63 is moved to the left, thelever is operated and the finger presses the lock-bolt downward, bycompressing the spring 68 and thus releases the toothed rack 53 andconse quently the toothed wheel 52 and the axle 51. On the projection ofthis axle 51, 1s placed a lever 69 which is connected with one of theends of the lever 70, through a rod 71, which consists of two pieces andcan be lengthened or shortened by means of a sleeve 72. The ends of thetwo parts of the rod bear opposite threads, which screw into the sleeve72. The lever 70 is fixed on an axle 73 and is provided with aprojection 74, on which the counterweight 75 is mounted. Thecounterweight can be replaced by a spring.

Fig. 3 shows how when the head 54 is released by the disengagement ofthe lockbolt 60, the counterweight presses the lever 69 upward so thatthe axle 51 is turned in the direction of the arrow (Fig.7 Toothedwheels 50 act on the toothed racks so as to cause the wedge-shapedpieces 47 to lower. At this stage, the sliding members 41 and 42 and therollers are removed from the upper corresponding roller, and theejection of the finished screw bolt takes place. This effect is obtainedowing to the fact that the rod 74 which bears the counterweight isconnected to a rod 77, at the end of which is placed a slide 78 whichreceives a pin 79 that is fixed to a lever 80 on the shaft 65 on whichis also fixed the lever 64. The oscillation of the lever 64 whichreleases the lock bolt, presses the bolt 79 upward near the end of theslide, so that when the counterweight 75 draws back, owing to thewithdrawal of the bolt lock 60, the rod 77 will be drawn downwardimmediately after the roller shafts have been spread and thus pull thelever 80 downward, which movement will turn the axle 65 and cause thelever 64 to draw the clutch 30 back through the agency of the levers 63and 36.

v The ejection of the finished piece can also be produced by hand. Forthis purpose, the projecting portion of the shaft 62, upon which ismounted the lever 36, bears a hand lever 76 by pressure on which theoscillation of the axle 62 and the release of the lock bolt, isproduced. Finally, the machine is provided with a device which returnsthe rollers into their normal position as soon as the rolled pieces areejected, thus permittin another bolt to be rolled. This device isrepresented in Figs. 4 and 5. As explained above, the movement of thecounterweight 75 corresponds with the ejection of the finished piece,the lever 80 being drawn downward, so that the axle 65 of this lever isrotated. This axle 65 bears a finger 81 on which rests a locking bolt82, which is pressed downward by a spring 83, the stress of which is adustable by means of a screw 84. The axle 65 is rotated by the lever 94through the medium of link connections 70 and 71 indicated by dot anddash lines in Figs. 1 and 4:, and in full in Fig. 3 The rotation of theaxle 65 through the drop of the counterweight produces the lifting ofthe bolt 82 through the finger S1 and its disengagement with a clutch 85which is slidably mounted on the horizontal shaft 86. The shaft 86 isdriven by the main shaft 1 through the set of wheels 87. On the shaft 86is fixed a collar 88, against which presses a spring 89, the other endof which presses against the clutch member 85, so that at the momentwhen the clutch member is released by the bolt 82, it is pressed by theswing against the clutch member 90, so that this element alsoparticipates in the rotation of the shaft 86. The teeth of the clutchparts 85 and 90 are inclined so as to be brought into engagementwitheach other and in case some impediment placed accidentally between therollers should prevent them from approaching sufficiently near eachother, the spring 89 gives way and the two parts move away from eachother to prevent breakage. The member 90 bears on its periphery atoothed crown 91, which engages with a toothed rack 92 at and This rackhas a yielding connection 93 with the end of a lever 9%, keyed on theaide 73, bearing the lever of the counterweight so that the rotation ofthe sleeve 90 causes the rack-bar and the rod of lever 9a to be raised.The raising of this lever 9% causes the rotation of the axle 73, whichhas for its effect to return the counterweight to its original position,so as to produce the desired disengagements for the next operation. Asto bolt 82, it is necessary, in order to enable it to engage with itssleeve 85, that the sleeve be pushed back at the moment when the lockingbolt goes down. This result is obtained by means of a wedge-shaped piece95 carried by the rod of the rack 92, the inclination of said wedgecorresponding 0 with the inclination of the generating lines of a cone96 forming part of the sleeve 85. Piece 95 remains constantly in contactwith the cone, so that the sleeve 85 is pushed back when the rod 92rises.

I claim 1. In a screw threading machine having a plurality ofcooperating roller shafts carrying thread-forming dies, means formounting said shafts comprising front and rear heads, a. plate rotatablymounted in said rear head, stub shafts ournaled in said plate, ball andsocket couplings connecting said stub shafts with said roller shafts,means for driving said shafts in unison, and means mounted in said rearhead for turning said plate, whereby to effect relative adjustmentbetween the die shafts during the rotation of said die shafts.

2. In a screw threading machine having a plurality of cooperating rollershafts carrying thread-forming dies, means for mounting said shaftscomprising front and rear heads, a plate rotatably mounted in said rearhead, stub shafts journaled in said plate and having flexible couplingswith said roller shafts, means for driving said shafts in unison, meansfor turning the rotatable plate to effect relative adjustment betweenthe shafts during the rotation of the shafts, and automatically actuatedmeans for separating the shafts at their die-carrying ends on thecompletion of the screw threading operation.

3. In a screw threading machine having a work holding piece and aplurality of roller shafts carrying thread forming dies arranged incooperative relation, front and rear heads in which said shafts aremounted, mechanism for automatically throwing the shafts into and out ofoperation, a setting device for said shafts comprising slidablewedge-shaped supports, a shaft having a plurality of pinions, some ofsaid pinions in engagement with and adapted to actuate the supports, atoothed rack adapted to mesh with another of said pinions, a lever onsaid pinion shaft, a counter-weight connected with and controlling saidlever, a locking device associated with the counter-weight and adaptedto hold the latter in inoperative position, and means connected with thework holder and operable therethrough to effect the release of saidcounter-weight from its locked position and cause said weight to rotatesaid pinion shaft as set forth.

4. In a screw threading machine having a work holder and a plurality ofroller shafts carrying thread forming dies arranged in cooperativerelation, front and rear heads in which said shafts are adjustablymounted, mechanism for automatically throwing the shafts into and out ofoperation, a setting device for said shafts comprising slidablewedge-shaped pieces disposed in cooperative relation, a shaft havingpinions adapted to mesh with said slidable pieces, a counterweightconnected with said pinion shaft and adapted to throw the die shaftsinto and out of operative position through the medium of said slidablepieces, locking device for keeping said die shafts in working position,and means for automatically releasing said locking device andwithdrawing the piece worked, comprising a rod connected at one end tothe locking device for the die shafts and at its other end with the workholder, said former connection having a lost motion when operating inone direction whereby to prevent the counter-weight from withdrawing thework holder before the die shafts have been brought into inoperativeposition.

5. In a screw threading machine having a work holder and a plurality ofroller shafts carrying thread-forming dies arranged in cooperativerelation, front and rear heads in which said shafts are adjustablymounted, mechanism for automatically throwing the shafts into and out ofoperation, a setting device for said die shafts comprisingslidablewedge-shaped pieces, a shaft having pinions adapted to mesh withand actuate said pieces, a toothed rack meshing with one of saidpinions, a counter-weight connected with said pinion shaft and adaptedto actuate the same, a locking device associated with the rack forholding said counterweight in inoperative position, means forautomatically releasing said counter-weight through the medium of thework holder, and a means for restoring the counter-weight and itsassociated parts into their working position, said means comprising arotatable shaft having a clutch mounted thereon, a rack bar meshing withsaid clutch, a connection between said rack bar and said counter-weight,and a device for automatically disengaging the clutch elements.

6. In a screw threading machine having a plurality of roller shaftscarryingthreadforming dies arranged in cooperative relation, front andrear heads in which said shafts are mounted, a plate rotatably mountedin one of said heads for carrying the shafts mounted in said head, meansfor rotating said plate, stub shafts mounted in one of the heads anddisposed in parallel relation, driving pinions mounted on said shafts,one of which pinions is mounted so as to permit movement relative to itsshaft, ball and socket couplings connecting the shafts carrying thethread-forming rollers with the stub shafts, means for impartingmovement tosaid stub shafts comprising a gear, driving means adapted tomesh with the pinions on the stub shafts, the pinion which is movablerelatively to the shaft being provided with a hub having a screwshapedface, and means associated with said screw elements whereby the workingfaces of the threaded rollers are shifted relatively to each other, thepinionsbeing maintained in the same position relatively to the headwhich carries the stub shafts.

In witness whereof I have hereunto set my hand in presence of thewitnesses.

HENRI DES'PAIGNE. lVitnesses G. MEYER, GREGORY PHELAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G.

